ISO 15500-10:2015

Road vehicles - Compressed natural gas (CNG) fuel system components - Part 10: Gas-flow adjuster

ISO 15500-10:2015 specifies tests and requirements for the gas-flow adjuster, a compressed natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This part of ISO 15500 is applicable to vehicles using natural gas in accordance with ISO 15403‑1 (mono-fuel, bi-fuel, or dual-fuel applications). It is not applicable to the following: a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer; b) fuel containers; c) stationary gas engines; d) container mounting hardware; e) electronic fuel management; f) refuelling receptacles. NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this part of ISO 15500 and tested according to the appropriate functional tests. NOTE 2 All references to pressure in this part of ISO 15500 are to be considered gauge pressures unless otherwise specified. NOTE 3 This part of ISO 15500 is based upon a service pressure for natural gas as a fuel of 20 MPa (200 bar[1]) settled at 15 °C. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 25 MPa (250 bar) service pressure system will require pressures to be multiplied by 1,25. [1] 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.

Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 10: Régulateur du débit de gaz

General Information

• Status: Published
• Publication Date: 29-Nov-2015
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
• Drafting Committee: ISO/TC 22/SC 41/WG 3 - Fuel system components and refuelling connector for vehicles propelled by gaseous fuel
• Current Stage: 9092 - International Standard to be revised
• Start Date: 14-Feb-2023
• Completion Date: 13-Dec-2025

Relations

• Revises: ISO 15500-10:2001 - Road vehicles - Compressed natural gas (CNG) fuel system components - Part 10: Gas-flow adjuster
• Effective Date: 20-Aug-2011

Overview

ISO 15500-10:2015 is an international standard that specifies the requirements and test methods for the gas-flow adjuster used in compressed natural gas (CNG) fuel systems of road vehicles. This component plays a critical role in regulating the flow of natural gas fuel within motor vehicles, as defined under ISO 3833. The standard applies to vehicles using natural gas according to ISO 15403-1, covering mono-fuel, bi-fuel, and dual-fuel applications. It excludes certain components such as liquefied natural gas (LNG) systems upstream of the vaporizer, fuel containers, stationary engines, and refueling receptacles.

This document is part 10 of the broader ISO 15500 series dedicated to various CNG fuel system components, aiming to ensure safety, reliability, and interoperability across natural gas-powered vehicles globally.

Key Topics

• Scope and applicability: Establishes the functional and operational domain of the gas-flow adjuster, emphasizing its use in motor vehicles fueled by compressed natural gas.
• Marking requirements: Components must be clearly marked with manufacturer details, model number, working pressure, temperature range, and flow direction to assure traceability and proper installation.
• Construction and assembly: Sets guidelines ensuring the gas-flow adjuster complies with the general standards of ISO 15500-1 and ISO 15500-2, including dimensional tolerances and design criteria.
• Testing procedures: Defines rigorous tests including:
  • Hydrostatic strength to verify pressure resistance (tested at 4 times the working pressure or a minimum of 0.6 MPa).
  • Leakage tests at extreme temperatures (-40 °C to 120 °C) to ensure tightness under working conditions.
  • Continued operation testing for devices subject to frequent adjustments, simulating 100,000 cycles to assess durability.
  • Electrical tests where applicable, such as insulation resistance and minimum operating voltage to evaluate electrical safety and functionality.
• Pressure considerations: All pressures referenced are gauge pressures. The standard is based on a 20 MPa (200 bar) service pressure at 15 °C, with adjustment factors provided for higher pressures.

Applications

ISO 15500-10:2015 facilitates the design, manufacture, and quality assurance of gas-flow adjusters integral to the CNG fuel delivery systems in:

• Passenger vehicles and commercial trucks running on natural gas.
• Mono-fuel and dual-fuel systems where vehicles use only natural gas or a mix with traditional fuels.
• Ensuring component compatibility and safety during normal operation and servicing in natural gas vehicles.
• Supporting the expansion of environmentally friendly fuel options by providing a standardized framework for critical CNG components.
• Assisting manufacturers in meeting regulatory and safety requirements for natural gas vehicles globally.

Related Standards

ISO 15500-10:2015 works in conjunction with other parts of the ISO 15500 series that cover comprehensive aspects of CNG systems:

• ISO 15500-1: General requirements and definitions for CNG fuel system components.
• ISO 15500-2: Performance and general test methods applicable to all CNG components.
• Additional parts detailing valves (manual, automatic), injectors, pressure regulators, safety devices, and fuel lines.

It also aligns with complementary standards including:

• ISO 3833: Definitions of vehicle types applicable to the gas-flow adjuster.
• ISO 15403-1 and ISO/TR 15403-2: Quality specifications for natural gas used as a vehicle fuel.

---

By adhering to ISO 15500-10:2015, manufacturers and stakeholders ensure that gas-flow adjusters in CNG vehicles meet standardized performance and safety benchmarks, supporting the wider adoption and safe operation of compressed natural gas as a clean alternative automotive fuel.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 15500-10
Second edition
2015-12-01
Road vehicles — Compressed natural
gas (CNG) fuel system components —
Part 10:
Gas-flow adjuster
Véhicules routiers — Composants des systèmes de combustible gaz
naturel comprimé (GNC) —
Partie 10: Régulateur du débit de gaz
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . 2
5 Construction and assembly . 2
6 Tests . 2
6.1 Applicability . 2
6.2 Hydrostatic strength . 3
6.3 Leakage . 3
6.4 Continued operation . 3
6.5 Insulation resistance . 3
6.6 Minimum operating voltage . 3
Bibliography . 4
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 41, Specific
aspects for gaseous fuels.
This second edition cancels and replaces the first edition (ISO 15500-10:2001), which has been
technically revised.
ISO 15500 consists of the following parts, under the general title Road vehicles — Compressed natural
gas (CNG) fuel system components:
— Part 1: General requirements and definitions
— Part 2: Performance and general test methods
— Part 3: Check valve
— Part 4: Manual valve
— Part 5: Manual cylinder valve
— Part 6: Automatic valve
— Part 7: Gas injector
— Part 8: Pressure indicator
— Part 9: Pressure regulator
— Part 10: Gas-flow adjuster
— Part 11: Gas/air mixer
— Part 12: Pressure relief valve (PRV)
— Part 13: Pressure relief device (PRD)
iv © ISO 2015 – All rights reserved
...